Patent Application
20050139243
1. Field of Invention
The present invention relates generally to pressure washer apparatus, and more particularly, to methods and apparatus for separating and containing higher and lower-density from contaminated washing fluids for use in the pressure washing system.
2. Description of the Relevant Art
Contamination of the environment by man-made substances has been considered a serious world-wide problem. Recently, concern about contamination of earth, air, and groundwater by oil, toxic chemicals, and other hazardous wastes has expanded beyond large-scale industry to encompass the activities of many small businesses including automobile service stations, and many others. Both government regulations and social outcry have placed tremendous pressure on these businesses to avoid discharging hazardous wastes into the environment in the course of ordinary business activities.
Many businesses partake in activities which are likely to produce waste which may be harmful to the environment. For example, in an automobile service station, washing or steam-cleaning auto parts, e.g., an automobile engine, often causes engine oil, gasoline, and other chemicals to enter a storm drain system, or other waterways, thereby leading to the potential contamination of groundwater. In addition, those who service remotely located equipment generally have a need to wash the equipment without discharging hazardous waste into the environment. By way of example, persons who service roof-mounted air conditioners that contain lubricating petrochemicals, trapped pollutants, or other chemicals are not permitted to wash the equipment in a manner that could cause chemicals to run off the roof and into the surrounding environment.
To address these concerns, portable, closed-loop pressure washing equipment has become widely available which may recover oil, chemicals, and other hazardous materials from an object which is being washed. These pressure wash assemblies may efficiently recirculate, heat, and repeatedly filter a washing agent to minimize the quantity of waste material produced during a washing process. Typical of such systems are disclosed in U.S. Pat. Nos.: 5,673,715; 5,785,067 and 5,803,982, incorporated herein by reference.
These zero-discharge, closed-loop wash apparatus typically deploy a multi-step contaminant removal process designed to independently separate the heavier weight or higher density contaminants, relative to the density of the washing fluid, as well as separate the lighter weight or lower density contaminants from the washing agent. A collection basin of the wash apparatus, for example, may be configured to remove the heavier weight contaminants through the application of filtration baskets or through sediment settling of the coarser heavier sediments along the bottom of the collection basin. The medium weight or medium density contaminants, on the other hand, may remain suspended in the washing fluid, where they may be removed by filtration through micron filters or the like. In some designs, a succession of micron filters may be used to remove successively smaller particulates and molecules from the washing agent.
Typically, these portable pressure washing systems include a load bearing support mechanism which supports the object designated for cleaning above the collection basin. Often, these support mechanism include a porous grate device which enables the run-off wash fluids to flow easily therethrough directly into the collection below. While this grate material has adequate strength for small to medium weight objects, such a surface cannot be utilized for larger and heavier objects designated for cleaning, such as large earth moving vehicles. In this instance the support mechanism requires substantially solid metallic plate members sufficiently thick to carrying the bulk weight object.
While these solid surfaces provided excellent weight bearing properties, silting from the run-off wash fluid often occurs, especially when larger, coarser particulates or large volumes of contaminants are initially highly abundant. This is especially true with large earth moving vehicles containing significant amounts of solids build-up accumulated during normal operation. Upon washing these vehicle, the heavy solids, sludge and collective silt build-up on the washing surface. This is quite problematic in that it often requires extensive manual cleanup or a prolonged cleanup time after the equipment has been washed. More conventional closed-loop systems typically employ some type of fluid filtration system which are inadequate for high solids run-off. These conventional filtration systems become overwhelmed, and are either clogged or require frequent filter cleaning or replacement, since these systems were not designed to accommodate such capacity. Accordingly, it would be desirable to provide a closed-loop washing system that can accommodate the removal of such high solids contaminants run-off.
The present invention relates to a closed-loop pressure washing system adapted for removal and recovery of high solids contaminants from an object. The washing system includes a support platform having a support surface adapted to support the object while a washing fluid is flowed over the object to remove the high solids contaminant. A collection device is provided in flow communication with the support surface, and is adapted to collect and channel the run-off washing fluid and run-off high solids contaminant from the support surface towards a collection basin. A high solids separation assembly is in flow communication with the collection basin, and is adapted to separate and displace the collected high solid contaminants from the collected run-off fluids in the collection basin to a discard region spaced-apart from the collection basin. This separation assembly, however, substantially maintains the run-off washing fluid in the collection basin. The washing system further includes a clarifying reservoir in flow communication with the collection basin, and is configured to hold the run-off fluid therein for reuse back to the washing system.
Accordingly, in a closed-loop washing system where high-solid contaminants removal is substantial, the separation assembly is capable of high solids waste removal to a remove site while retaining the run-off washing fluids for collection in a clarifying reservoir and/or filtering for reuse back in to the washing system. Such capacity of solid contaminants removal is highly desirable, especially when run-off high solids contaminant is initially abundant. As mentioned, conventional closed-loop washing systems are not capable of such high-solids removal, and often overwhelm the capacity thereof.
In one embodiment, the separation assembly includes a drag conveyor device having a separation station thereof immersed in the slurry of run-off washing fluid and high solids deposited in the collection basin and adapted to separate a portion of the deposited high solid contaminants from the slurry. The separation assembly further includes a discarding station spaced-apart from, and at a vertical elevation above the separation station. The discarding station is adapted to discard the collected portion of the deposited high solid contaminants from the drag conveyor. Preferably, the drag conveyor includes a continuous chain member extending between the separation station and the discarding station, and having a plurality of drag weirs spaced-apart along the chain member, each the drag weir being adapted to separate and drag the portion of the deposited high solid contaminants at the separation station and deposit the portion of the deposited high solid contaminants at the discarding station. The discarding assembly includes a sleeve member substantially enclosing the chain member and drag weirs in a manner enabling the collected run-off fluid in the collection basin to filter between the sleeve and the drag weirs.
In another specific configuration, the collecting device includes an elongated receiving channel in flow communication with the support surface, and a delivery portion in flow communication with the collection basin. In this manner, the run-off washing fluid and run-off high solids contaminant collected from the support surface are substantially flowed to the collection basin. The collecting device preferably further includes an auger member rotatably mounted and positioned in the channel in a manner causing the collected run-off washing fluid and run-off high solids contaminant to move from the elongated receiving channel to the delivery portion thereof for delivery to the collection basin. Further, the elongated channel is positioned adjacent an edge of the support surface, and the support surface is shaped for gravity flow of the run-off washing fluid and run-off high solids contaminant toward the channel.
In still another arrangement, the washing system includes a flush assembly having one portion fluidly coupled to the clarifying reservoir, and another portion fluidly coupled to one end of the elongated channel to flush the run-off fluid and high solids contaminant toward the delivery portion thereof. Further, the washing system may include a high capacity fluid cannon coupled to the clarifying reservoir. The fluid cannon includes a nozzle member and a fluid cannon pump device configured to eject the stored fluids at a substantial capacity and rate. This rate is preferably in the range of about 40 gal/min to about 80 gal/min.
Another embodiment illustrates that the clarifying reservoir includes a plurality of baffles aligned in a manner to encourage the deposition of light solids from the collected run-off fluids as it flows therethrough. This is performed by providing an array of baffles in the clarifying reservoir wherein the deposited fluids pass through the baffles, causing the light solids to be excreted therefrom
In another aspect of the present invention, a high load capacity closed-loop washing system is provided for the support of and contaminant removal from a substantially heavy load object. The washing system includes a support platform for supporting the heavy load object having a fluid impervious upstanding peripheral side walls and a fluid impervious support surface extending atop the peripheral side walls to collectively define an enclosed interior cavity therein. The support platform includes a flowable support material curable into a relatively low density, high compressive strength material support enabling vertical support the heavy load object atop the support surface while a washing fluid is flowed over the object to remove the high solids contaminant. A collection device is in flow communication with the support surface, and is adapted to collect the slurry of run-off washing fluid and run-off high solids contaminant from the support surface in a collection basin. The washing system further includes a clarifying reservoir in flow communication with the collection basin, and is configured to store run-off fluid therein for reuse back to the washing system.
Thus, washing system provides a high compression-strength support platform which is relatively light weight. Thus, the curable core enables fabrication in any flowable shape, while providing an excellent compressive strength-to-weight ratio.
In one specific embodiment, the high compressive strength material is provided by a high strength cellular material, such as a foamed concrete. Thus, the concrete is easily flowed into the interior cavity similar to molding techniques.
The assembly of the present invention has other objects and features of advantage which will be more readily apparent from the following description of the Detailed Description of the Embodiments and the appended claims, when taken in conjunction with the accompanying drawings, in which:
While the present invention will be described with reference to a few specific embodiments, the description is illustrative of the invention and is not to be construed as limiting the invention. Various modifications to the present invention can be made to the preferred embodiments by those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims. It will be noted here that for a better understanding, like components are designated by like reference numerals throughout the various figures.
Attention is now directed to
Accordingly, unlike the filtration systems of conventional closed-loop washing systems, the separation assembly is capable of high solids waste removal and transport to a remove site while retaining the run-off washing fluids for collection in a clarifying reservoir. During periods of high solids waste removal, the present invention enables the remaining run-off washing fluid to pass through the usual filtering devices without overwhelming these filtering systems.
Briefly, it will be understood that the term “washing fluid” is applied to a washing agent used to wash contaminants from the surface of an object. For instance, water is the most typical washing agent, but may further include cleansing additives such as detergents, soda ash, etc. Moreover, the terms “lower-density contaminants” or “light weight contaminants” are referred to as contaminants with a specific gravity less than that of the washing fluid. Thus, the light weight contaminants naturally separate and float to the surface of the collected washing fluid. Such contaminants may include oil, gasoline, foams, plastics, ash, etc. In contrast, it will be understood that the terms “heavier-density contaminants” or “heavy weight contaminants” are referred to as contaminants with a specific gravity greater than that of the washing fluid. Finally, “medium-density contaminants” or “medium weight contaminants” are referred to as contaminants with a specific gravity similar to that of the washing fluid which may be suspended therein. All three weight contaminants will be included, in various proportions, in the run-off high solids contaminant washed off these large earth moving vehicles.
The closed-loop pressure washing system 20 includes a clarifying reservoir 28 (
Referring to
Once the initial coarse cleaning of an object atop the support surface 22 has commenced using the water cannon 30, depending upon the quantity of solid contaminants removed, silting or settle contaminant buildup can occur. When such buildup is directly on the load bearing support surface 22, the water cannon nozzle can be employed in a hose-like manner to manually spray or flush the solids from the support surface 22 toward the collection device 23.
The support surface 22 is substantially rectangular-shaped having an upper elevation side and an opposite lower elevation side to facilitate run-off toward the collection device 23 located along the edge of the opposite lower elevation side. Preferably, the support surface is gradually sloped or graded toward the collection device 23 in the range of about 1° to about 4°. Moreover, as best viewed in
In accordance with the present invention, the collection device 23 includes an elongated receiving portion or receiving channel 38 thereof in flow communication with the support surface 22, and having a delivery portion 40 in flow communication with the collection basin 25. As shown in
During periods of high solids contaminant removal from the objects being cleaned atop the support surface 22, the buildup of the removed solid contaminants can be flushed into the elongated receiving channel 38 (via the cannon). The high density solid contaminants then tend to build-up and congregate at the bottom of the channel, while the lighter weight and medium weight contaminant (suspended in the run-off washing fluid) flow toward the collection basin 25. Eventually, the buildup of the higher density solid contaminants will block flow any fluids in the channel, and cause flooding onto the support surface. Accordingly, a transport device, generally designated 41, is provided that cooperates with the receiving channel 38 to transport the deposited solid contaminants in the channel toward the collection basin 25. In this manner, the run-off washing fluid and run-off high solids contaminant collected from the support surface are substantially flowed and/or transported to the collection basin for further handling by the separation assembly 26.
As best viewed in
To accommodate the circular cross-sectional dimension of the helical blades, the transverse cross-sectional dimension of the elongated receiving channel 38 is preferably semi-circular at the bottom thereof, and has a diameter slightly greater than that of the blades. The tolerance between the edge of the helical blades 45 and the interior side walls of the channel is in the range of about ⅛ inch to about ¼ inch. Such tolerance is sufficiently small to enable the auger to transport substantially all the deposited solids to the collection basin, while being sufficiently large to prevent interfering contact of the blade with the walls during operation.
A plurality of bearings 47 are spaced apart along the receiving channel 38 for rotational support thereof (
Referring now to
In one specific embodiment, the separation assembly 26 includes a drag conveyor device 51 having a separation station thereof immersed in the slurry of run-off washing fluid and run-off high solids contaminants transported to the collection basin 25 (via the auger member 42), and adapted to separate the higher density solid contaminants from the slurry. The separation assembly 26 further includes a discarding station 53 spaced-apart from, and at a vertical elevation above the separation station 52. The discarding station 53 is adapted to discard the separated and dragged higher density solid contaminants from the drag conveyor to a discard site.
As best viewed in
In one alternative embodiment, to facilitate guidance and positioning of each weir 60 as they are dragged by the drive chain device 57, the opposed edges thereof may include end guides (not shown) that engage associated guide rails (not shown) of the frame assembly that extend along the drive path. Accordingly, the guide rails, the end guides and the link chain device would cooperate maintain the planar face of each weir 60 substantially perpendicular to the direction of movement along the drive path smoothly and continuously between the separation station and the discarding station.
A sleeve member 61 encloses the chain drive device 57, weirs 60 and frame assembly between the separation station 52 and the discarding station 53. This sleeve member not only provides a measure of safety from the moving conveyor components, but also provides a bottom support surface 62 that cooperates with the bottom edge 63 of the drag weirs 60 to facilitate collection of the separated higher density solid contaminants. Similarly, the adjoining interior sidewalls 65 are oriented and sized cooperate opposed side edges 66 of the drag weirs 60 to separate and move the collected higher density solid contaminants along the bottom support surface 62 of the sleeve member from the separation station 52 to the discarding station 53. Accordingly, the interior bottom support surface 62 and adjoining interior side walls 65 of the sleeve member 61 are adapted and sized for sliding receipt of the drag weir 60 therethrough.
The sleeve member 61 includes an opened mouth portion 67 at the separation station 52 of the that enables the drag weirs 60 to enter the collection basin 25 as they round the bottom sprocket 58″. At the separation station 52 (
The drag weirs are preferably composed of steel or plastic, and have leading edges 63 and side edges 66 that are sized and dimensioned to be slidingly received within the sleeve with a tolerance with the interior side walls 65 of the sleeve member 61 in the range of about ⅛ inch to about ½ inch. This tolerance is sufficiently small to enable scooping, dragging and retaining of the separated higher density solid contaminants through the sleeve member, while enabling the run-off washing fluid to pass therebetween so that the same is maintained in the collection basin 25.
As the separated solid contaminants from the collection basin 25 are dragged up the bottom support surface 62 of the sleeve member, they solids are deposited through the discarding station. Similar to the separation station 52, the discarding station 53 provides a discard opening 68 along the bottom support surface 62 upon which the drag weirs 60 are moved through as they are driven along the drive path. As the drag weirs 60 pass through the discard opening 68, gravity causes the dragged solid contaminants to fall therethrough. The discard region 27 may include a removable contaminant collection bin 70 placed below the discard opening 68 to enable gravity flow collection of the discarded contaminants.
It will be appreciated that the collection bin can be any collection device such as a trash can or even a wheelbarrow. It will further be understood that while only one such contaminant separation assembly is described in detail, other contaminant separators may be applied to separate the higher density solid contaminants from the slurry in the collection basin such as augers, vibratory conveyors, belt conveyors or bucket elevators.
Referring back to
Depending upon the quantity or flow volume of the run-off washing fluids into the collection basin 25 from the support surface 22, the pumping capacity of the sump pump 71 can be selected accordingly. Moreover, the sump pump can be configured to automatically operate during the operation of the water cannon, the pressure washer or transport device 41. In one specific example, the sump pump 71 may be provided by Zoeller Pump Co. of Louisville, Ky., Model No. M137, which has the pump capacity in the range of about 65 gal/min to about 95 gal/min.
Once the sump pump 71 delivers the run-off washing fluid to the clarifying reservoir 28 through the delivery inlet port 76, the stored washing fluids may be applied for two purposes: providing semi-filtered washing fluid to the high volume water cannon 30, as well as providing fully-filtered washing fluid to the pressure washing 31.
As shown in
To initially collect these separated contaminants, the first settling portion 81 of the clarifying reservoir is conical-shaped and is positioned below an upstream first portion of the baffles 78. The conical narrowing tapers to a small diameter mouth portion 83 (preferably about 4 inches in diameter) wherein the contaminants settle from suspension after passing through the baffles 78. A first valve device 82 having a large bore opening is preferably positioned at the mouth portion 83 to enable selective venting of the collected contaminants therethrough into a disposable filter bag or the like positioned on the other side. Preferably, the first valve device 82 is provided by a rapidly opening, ball valve or pneumatically assisted valve which may be periodically operated manually or automatically when the separated solid contaminants sufficiently accumulate at the conical bottom portion.
Applying the pressure head of the fluids in the clarifying reservoir, upon opening of the first valve device 82, the accumulated and settled contaminants in the conical first settling portion 81 are periodically flushed from the reservoir into the filter bag or other container. The filtered solids are retained in the filter bag or container for appropriate disposal. The draining of the sludge or lighter weight solids from the bottom of the conical settling portion 81 can be automated which reduces manual maintenance and operation, and ensures the periodic removal therefrom.
Alternatively, the first valve device 82 may be fluid coupled to a delivery hose 85, for selective delivery to a remotely positioned container or the like. In still other embodiments, the outlet of the delivery hose may simply redeliver the settled contaminants from the conical settling portion 81 back into the receiving channel 38 of the collection device for recycling through the separation assembly 26.
In still other specific embodiments, the clarifying reservoir 28 may include a second conical settling portion 86 positioned adjacent to and downstream from the first conical settling portion 81. Similar to the first conical settling portion 81, the bottom wall tapers inwardly toward a small diameter mouth portion 87 where a second valve device 88 is seated. Since this second conical settling portion 86 is positioned further downstream relative the flow through array of baffles 78, the quantity of deposited silting and settling contaminants is significantly less. Thus, the periodic flushing of this cone would be performed less frequently.
In yet another specific embodiment, the second valve device 88 could be fluidly coupled, via a flush line 90 (
In accordance with the present invention, as mentioned, the clarifying reservoir 28 provides a source of semi-filtered washing fluids for a high volume water cannon 30. As illustrated in
The high volume water cannon 30 includes a cannon pump 95 having an inlet side coupled to the outlet of the fluid line 92, and an outlet side device to a coarse cannon filter pack 96. In turn, the cannon filter pack 96 is fluidly coupled to a delivery pressure line 97 having a cannon nozzle 98 at the opposite end thereof for delivery of the semi-filtered washing fluids from the water cannon 30. These water cannon pumps 95, such as those provided by Scott Pump of Cedarburg, Wis., Model No. VFE50, are capable of expelling fluids in the range of about 40 gal/min to about 80 gal/min, that provides a low spray in the range of about 60 psi to about 70 psi. For example, in the present application, the ejection of the semi-filtered washing fluid from the cannon nozzle 98 of a pressure line 97 fluidly coupled to the outlet of the coarse filter pack 96 is about sixty (60) gal/min at a velocity of about 80 ft/sec, and a pressure drop across the cannon nozzle of about 50 psi. Accordingly, this coarse washer provides significant capacity to impinge large volumes of fluids against the vehicle at a significant force for contaminant removal.
The cannon filter pack 96 includes a conventional two-hundred (200) micron bag filter that provides relatively coarse filtering of the semi-filtered washing fluid before ejection from the cannon nozzle 98. The semi-filtered washing fluid, preferably water, contains dissolved solids which appears as dirty water. However, this solution is sufficient for first stage washing again if desired.
In another specific configuration, the water cannon may be mounted directly to the side wall 93 of the clarifying reservoir, thereby eliminating the need for the intermediate fluid line 92. This arrangement is further advantageous in that the overall footprint of the washing assembly is reduced since a separate area need not be provided for the relatively large cannon pump 95.
Referring back to
The spray pressure washer 31, on the other hand, draws fluid from the clean water reservoir and further through more stringent filtering than is necessary for the high volume water cannon. In fact, due in-part to the sensitive nature of the componentry of the pressure washer 31, the filtering is performed prior to coupling to the pressure washer rather than after the pump as in the case with the water cannon. As best viewed in
The delivery pump 105, by way of example a Teel Pump of Northbrook, Ill., Model No. 4RJ89, forces the water through a pressure washer filter pack 106 or series of filter packs to deliver filtered washing fluid to a pressure washer 31. In turn, the conventional pressure washer delivers the pressurized, filtered washing fluid, via a pressure pump, to a pressure wand 107. These spray pressure washing devices 31 provide a mechanism to pressure wash the object using a conventional pressure wand 107 and a compatible spray nozzle 108. The pressure pump can be provided any conventional high pressure pump assembly, and is preferably capable of delivering a variable pressure for a selective pressure spray application. One such conventional pressure pump, for example, is that provided by WANNER, Model No. MD3EABJSSECA, which is capable of providing a low pressure spray in the range of about 50 psi and a high pressure spray in the range of about 3000 psi
A fresh water rinse can be provided for final rinsing of the equipment, and can be added manually or automatically when washing fluid in the clarifying reservoir becomes too low. On the other end, since the system operates as a fixed volume, closed loop system, too much fluid in the separation tank will require removal before an overflow situation occurs. Thus, a safety overflow can provided to dispense overflow fluid to a drain or waste source. This may simply be performed using the valve devices of the settling cones.
Since the clarifying reservoir promotes separation of both the heavy and medium weight (density) contaminants form the washing fluids, the lighter density contaminants (e.g., oils) will float to the top of the washing fluids in the clarifying reservoir. As the washing fluids flow over the over weir 60 and into the cleaner water chamber, the lighter weight contaminants will be trapped by the walls defining the cleaner water chamber. To remove these lighter weight contaminants, if oils are being washed off without soap, a conventional mechanical oil skimming device can be located at the top of the cleaner water chamber to remove the free floating oil. The contaminates can then be collected and directed into a container for proper discarding. However, if the oils are intensely mechanically emulsified, oleiophilic surfaces can be used to reclaim the majority of the oils. If the oils are chemically emulsified, a specially designed clay or carbon filter is used to remove the oils below the sewer districts acceptance levels. Any time oils are being washed, it is prudent to discharge the water through an organo-clay filter prior to being dumped to sewer.
There are specific soaps called “quick release soaps”. When these soaps are used to wash items covered with oils, the quick release soaps retain the oils in solution as long as the fluid is in motion. When the oil emulsified water reaches a quiet location for several minutes, the majority of the oil is released and collects on the surface of the water. This quiet location also allows the solids to separate from the water by gravity. Because 100% oil release cannot be guaranteed in the time available in the system, it is always prudent to run the water through a clay or carbon filter designed to remove oils from the water stream prior to disposal down the sewer.
In yet other configurations, the washing apparatus may also include an ozonation system (not shown) to ozonate the process fluid in the clarifying reservoir 28. As set forth in U.S. Pat. No. 5,785,067, which is incorporated by reference, ozonation is highly beneficial since it is highly oxidizing, and will attack substantially any contamination in the water. Briefly, the ozonation system includes a recirculation pump that draws process fluid from the clean water reservoir 100 through a screened inlet end and into recirculation line. Once the process fluid is drawn into the recirulation line from the recirculation pump, the process fluid flows through a gas-liquid mixing device, such as a venturi-type injector. The injector is further coupled to an ozone generator, such as the model CS-1200 available commercially from Clearwater Technologies which is capable of generating 0.25 grams of ozone per hour. The ozonated water is then returned to the clarifying reservoir 28, via an recirculation line. In this arrangement, the ozonated water is caused to directly attack the bacteria and associated odors from the run-off process fluid in the collection compartment and in the separation compartment.
In another aspect of the present invention, as best shown in
The support surface 22 provides a load bearing surface, and is preferably a solid metal plate material of about ¼ inch to about ½ inch in thickness. Further, to facilitate sufficient traction, the support floor is constructed of diamond plate carbon steel which has been sandblasted, and surfaced with an epoxy paint. Large grained sand may be incorporated with the paint to enhance the non-skid work surface quality as well.
The upstanding peripheral side walls 110, 110′, 110″ and 110′″ of the frame assembly 32 are preferably composed of a substantially rigid, fluid impervious material, such as metal. For example, as viewed in
The frame assembly 32 preferably includes a bottom support surface 113 upon which the side wall beams 110, 110′, 110″ and 110′″, as well as the support beams are situated atop. This bottom support surface 113 includes a foot print similar to that of the top support surface 22 which both mount to the edges of the side wall beams.
Collectively, upon mounting of these support surfaces 22, 113 peripherally to the side wall beams, the enclosed interior cavity is formed therein.
The flowable support material 111 placed in the interior cavity is preferably provided by a relatively low density, high compressive strength material support enabling vertical support the heavy load object atop. One such flowable composition is provided by a high strength cellular materials such as foamed concrete. Upon curing, this cellular material provides excellent compressive strength to weight ratio, being in the range of about 500 ft. to 1500 ft. This is due in part to the fact that such foamed concrete per volume is 70% air.
To place the flowable support material 111 in the interior cavity of the support platform 21, an injection port 115 is provided in beam 110′. This port may be provided in one of the side wall beams or in the top support surface 22. A vent port may also be included as well to provide an air vent as the flowable support material displaces the air. Using delivery lines, the foamed concrete is injected into the interior cavity.
Once the foamed concrete cures, a relatively low density, high compressive strength material support fills the interior cavity, enabling the support platform to support heavy loads object atop. For example, such structures may be capable of sustaining weights in the range of about 100 lbs/in2 to 400 lbs/in2.
While this invention has been described in terms of several preferred embodiments, there are alterations, permutations, and equivalents which fall within the scope of this invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.
| Number | Date | Country | |
|---|---|---|---|
| 60463515 | Apr 2003 | US |
